UGC 12591

Spiral Galaxy in Pegasus
UGC 12591
UGC 12591, taken by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationPegasus
Right ascension23h 25m 21.7s[1]
Declination28° 29′ 43″[1]
Redshift0.023179[1]
Heliocentric radial velocity6949 ± 10[1]
Distance394.26 ± 133.84 Mly (120.880 ± 41.036 Mpc)[1]
Apparent magnitude (B)13.90[1]
Characteristics
TypeS0/a[1]
Mass1.9×1012[2] M
Apparent size (V)1.7 × 0.7[1]
Other designations
MCG +05-55-015, PGC 71392

UGC 12591 is the third most massive known spiral galaxy, after ISOHDFS 27 and J2345-0449.[citation needed] It is located about 400 million light-years away from the Earth in the constellation Pegasus. In addition, it is the spiral galaxy with the highest known rotational speed[2] of about 500 km/s, almost twice that of our galaxy, the Milky Way. The high rotational speed means the galaxy must be very massive at the center; the galaxy has a mass estimated at 4 times that of the Milky Way,[3] making it the third of the most massive spiral galaxies known to date.

UGC 12591 is relatively isolated; the nearest galaxy to it is 3.55 million light-years (1.09 Mpc) away. However, its morphology suggests a merger or accretion event in its past: it is somewhat lenticular-like, with a central bulge and dust lanes reminiscent of the Sombrero Galaxy.[4]

References

  1. ^ a b c d e f g h "NED results for object UGC 12591". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 16 April 2017.
  2. ^ a b Giovanelli, R.; Haynes, M. P.; Rubin, V. C.; Ford, W. K. Jr. (1 February 1986). "UGC 12591 - The most rapidly rotating disk galaxy". The Astrophysical Journal Letters. 301: L7–L11. Bibcode:1986ApJ...301L...7G. doi:10.1086/184613. ISSN 0004-637X.
  3. ^ "A remarkable galactic hybrid". ESA/Hubble. Retrieved 16 April 2017.
  4. ^ Ray, Shankar; Bagchi, Joydeep; Dhiwar, Suraj; Pandge, M. B.; Mirakhor, Mohammad; Walker, Stephen A.; Mukherjee, Dipanjan (2022). "Hubble Space Telescope Captures UGC 12591: Bulge/Disc properties, star formation and 'missing baryons' census in a very massive and fast-spinning hybrid galaxy". Monthly Notices of the Royal Astronomical Society. 517 (1): 99–117. arXiv:2203.02885. Bibcode:2022MNRAS.517...99R. doi:10.1093/mnras/stac2683.

External links

  • Media related to UGC 12591 at Wikimedia Commons


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